Rotary fan for ventilation



(ModeL) J. T. & L. J. HOPE 81; L. C. ALEXANDER.

ROTARY. FAN FOR VENTILATION. No. 420,156. Patented Jan. 28, 1890.

I zk d a illllfillll 1 d 1 V///// a- @N //////As v WITNESSES INVENTORJ.J 6 W 7% NITED STATES JOHN T. HOPE, LUKE J. HOPE, AND LINDEN o.ALEXANDER, or KANSAS CITY, MISSOURI.

ROTARY FAN FOR VENTILATION.

SPECIFICATION forming part of Letters Patent No. 420,156, dated January28, 1890.

Application filed September 24, 1886- $erial No. 214,?73. (Modeh) To allwhom it may concern:

Be it known that we, JOHN T. HOPE, LUKE J. HOPE, and LINDEN C.ALEXANDER, citizens of the United States, residing at Kansas City, inthe county of Jackson and State of Missouri, have invent-ed certain newand useful Improvements in Rotary Ventilating-Fans; and we do herebydeclare that the following is a full, clear, and exact description ofthe invent-ion, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, forming a part of this specification.

Our invention has for its object to push against the air in theimmediate reach of the vanes of a ventilating fan and create a vacuum inthe rear of the said vanes, so as to increase the air-flow; and itconsists in the novel construction and combination of parts, which willbe first fully described, and specifically pointed out in the claims.

In the drawings, Figure 1 is a front elevation of the fan shown attachedto the wall and covering an opening therein. Fig. 2 is a transversesectional view of the fan, taken on the line a; a: of Fig. 1.

In the construction of our improved fan, B represents an annular plateof the proper dimensions. To one side of the plate B, a slight distancebelow the line of its axis, in opposite relations and in a horizontalplane, are attached by means of the rivets c 0 one end of the respectivebraces C C. Said braces C O are bent over the inner edge of the annularplate B and extended through the opening in said plate a suitabledistance, and the opposite ends are brought together and secured in anysuitable manner, preserving the same horizontal position as the oppositeends. Upon the joined ends of said braces C G is rigidly attached ajournal-box c, which extends to and is in line of the-.axis of theannular plate B. Extending directly across the opening in plate 13 fromone end portion of strip G to an opposite end portion, and secured tosaid ends of strips in a like plane, is a transverse brace 1). Upon thebrace D, in the line of the axis of the annular plate B, is attached ajournal-box cZ. Through the journal-box d, and also through the box 0 onbraces C C, is extended a shaft E. Upon the end portion extendingthrough and beyond box 0? is attached rigidly a thimble f. An annularmovable flat plate f,to form the periphery of the fan and coveringcylindricallya portion of the plate B, is next made, to the outer sideof which is attached the vanes F F of the fan. These vanes F F are madein a triangular shape, the base of each being attached fiatwise bysoldering or any other suitable mannerto said plate and a series ofvanes placed consecutively around said plate, the relative width of thebase of each vane being governed by the size of theflplate f, and uponwhich plate the edges of contiguous plates contact with each other.

The angles of each triangular vane bear such a relation to each otherthat when the apex of the vane is secured to the thimole in a planeoblique to the axis thereof one free edge of each vane will be straightand inclined as to the fan-shaft while the other free edge curves orarches outwardly. As the width of the vanes decreases in the directionof the thimble so does the degree in which the curve is given to theblades, it being in proportion to the length of the axis of the fan, soas to sustain the impact upon the air and produce the vacuum required.

The narrow end portion f of each of the vanes F are then given a partialtwist or turn in the direction of the inner straight edge of said vane,and the said end portion cut in a transverse direction and in the lineof direction of thirnble f, and attached to said thinlble by solderingto the longitudinal side of saidthi'mble in a plane oblique to the axisof said thimble and the series of vanes attached the stationary plate Bplaced around said opening.

In the operation of our improved fan, power is applied to rotate theshaft E in the direct on shown by the arrow in Fig. 1, the outer sideportions of the vanes of the fan strike upon the air and force the airaway from and in the direction of the rotation of said vanes, and avacuum is formed in rear and upon the under convex side portion of saidvanes, which draws the air-currents through the opening f around theshaft E, and the blast is increased.

In the fans of ordinary construction the vanes scoop the air and throwthe air-currents in the rear of the fan, while in the peculiarconstruction of our fan the impact of the outer side portion of thevanes upon the air in the described rotation of shaft E creates thevacuum which causes the countercurrent of air to concentrate the blast,and in this manner, the fans applied to the ventilation of air-conduitsof varying lengths, we are enabled to cause the concentrated blast toreach distances not obtainable by means of fans in common use.

IVe are aware of theLetters Patent of the United States granted toBlackman, No. 261,128, dated July 18, 1882, Kittoe, No. 329,052, October27, 1885, and Pelzer, No. 223,065, December 30, 187 9, the constructionof which fans and the mode of operation are for purposes dissimilar tothis application, in that the air is scooped up and thrown forwardbroadcast, while in our improved fan the air-blast is concentrated asdescribed.

Having fully described our invention, what we now claim as new, anddesire to obtain by Letters Patent, is

In a rotary fan, the combination of a shaft, a pulley at one endthereof, a thimble attached to the other end, triangular vanes eachattached at its apex to said thimble in a plane oblique to the axis ofthe fan and extending divergingly toward the pulley in a manner such asto leave one side of the triangular vane straight and inclined as to thefan-shaft and the other side outwardly curved and a ring located in aplane between said thimble and pulley, and to which the bases of thevanes are secured flatwise and consecutively, for the purpose described.

JOHN T. HOPE. LUKE J. HOPE. LINDEN O. ALEXANDER.

Witnesses as to signature of John T. Hope;

WILL L. HALL, MARK A. Foorn. \Vitnesses as to signatures of Luke J. Hopeand Linden O. Alexander: FRED. W. PERKINS, A. G. HOLMES.

